On Wed, Nov 13, 2013 at 6:34 PM, luke.leighton luke.leighton@gmail.comwrote:
On Wed, Nov 13, 2013 at 11:16 PM, luke.leighton luke.leighton@gmail.com wrote:
http://rhombus-tech.net/community_ideas/router/news/
uh... am i reading this right - that this router design could be up to 20 watts?? 4x USB2 @ 500mA (10W), 1x RTL8366 (3W) and an EOMA68 CPU Card (4W). That's.... a hell of a lot.
anyone any experience at dealing with that much power on small boards (4 amp @ 5V) ?
LM1084? any guidance on PCB layout anyone aware of?
l.
Well, this will obviously be a 4 layer board, but I can say with the MEBv2, we had tremendous problems with thermal dissipation of the LM2576 at 9-12vdc, at 6vdc is was manageable, but the MEBv2++ are 2 layer boards, and with the addition of a secondary power plane, it would probably have been fine. For the most recent versions, we are using an AP6503a, and so far at 6, 9,12 vdc the heat is non-existent. Not to mention, the local price of the AP6503 was .60c cheaper than the LM2576, and is 85-95% more heat efficient.
My point in mentioning the LM2576, is that they are functionally similar to the LM1084, and both Linear.